Richard wirth



(No Model.) 2 Sheet-Sheet 1,

R. WIRTH, J. NEUMANN 8v HILLENBRAND.

- FURNAGB.

No. 536,249. Patented Mar.26,1895.

I (No Model.) Q V I: 2 SheetsSh eet 2.

R. W IRTH, J. NEUMANN .& J HILLENBRAND.

Y FURNAGBY No. 536,249. Patented Mar. 26, 1895.

UNITED. STATES PATENT FFICE.

AND JULIUS HILLENBRAND, OF MANNHEIM, ASSIGNORS T O KEGLER, on MANNHEIM,GERMANY.

DANIEL FURNACE.

SPECIFICATION forming part of Letters Patent No. 536,249, dated March26, 1895. Application filed June 9, 1894. Serial No. 514,086. (Nomodel.)

To all whom itmay concern:

Be it known that we, RICHARD WIRTH, a resident of Frankfort-on-the-Main,Kingdom of Prussia, and J OHANN NEUMANN and JU- LIUs HILLENBRAND,residents of Mannheim, Grand Duchy of Baden, Germany, subjects of theEmperor of Germany, have invented certain new and useful Improvementsin-Furnaces, of which the following is a specification.

ing, or muffie furnace, in which coke is used as fuel. This furnace isintended chiefly for enameling, but it may be used also for heating agreat many articles produced'at temperatures reaching 1,200 centigrade.

The heating chamber consists as usual of refractory lining held in aframe of cast iron plates, and behind this-chamber is placed the furnacefrom which the furnace gases enter the chamber through openings in theback wall thereof behind a screen or bafifie that extends nearly to thetop of the chamber and pass out through openings in the side walls nearthe front and bottom into a surrounding casing or flue from which theyescape only after having circulated around the side walls, the bottomand the top of the said chamber. Air under pressure is supplied at thetop of an outer casing or flue which surrounds the inner casing,circulates around the top, sides, and bottom of the inner casing, bywhich it is heated, and enters a chamber from which it may be suppliedunder the control of valves either ben'eath the fire'grate, or throughpassages which lead into the opening in the back wall, where it mixeswith the furnace gases and insures their complete combustion.'

Reference is to be had to the accompanying drawings, forming part ofthis specification, wherein- Figures 1 and 2 represent verticalcrosssections, on lines X-X, Y-Y, respectively,

of Fig. 3 which represents a horizontal section on line Z-Z, Fig. 1.

The heating chamber A is constructed of fire-clay slabs A, A A A, whichare held together by iron plates B, B, B B The furnace is constructed offire-clay slabs sup- This invention relates to a heating, annealportedby the plates B, B, by the end and base plates B and'D The furnace gasesenter the heating chamber A through apertures O inthe wall A at whichpoint they are mixed with the heated air issuing from the orifices 29whereby complete combustion is effected. A fire-clay baffie A is placedopposite the openings 0 whereby the gases are deflected against the topof the heating chamber, part of them passing under the baffle A Thelatter also prevents particles of coke which are carried along withthegases from flying about within the chamber and becoming deposited onthe articles placed in the oven.

The hot gases pass out through the openings b made near the front in theside walls of the chamber into the inner flue surrounding the saidchamber and inclosed by the iron platesO, O, 0 and C The verticalpartitions C divide the side fiues into two parts so that the hot gasesentering the flue at the openings I) pass down through the openings b,into the bottom flue, thence horizontally into the rear part of the sideflues and then upward through the openings 19 into the top flue, andthen horizontally forward into the chimney G. The inner flue issurrounded by the air heating inlet passages or flues inclosedbetweenthe casing of the inner flues and the iron plates D, D, D and D formingthe outer casing. The air blastentering at H passes as shown by thearrows, through the outer'top flue, thence down the outer side flues,and through the openings 0, into the outer bottom flue, whence the nowheated air passes through the openings e in the plate E into the chamberinclosed by the plates F, B

E, and D By opening the regulator f in the plate F the heated air can beadmitted beneath the inclined grate R and by opening the regulator gitpasses up the air passage P and emerges at the orifices p in the opening0 where it mixes with the heating gases. water tank T is placed underthe grate.

We claim-'- 1. In a furnace, the combination of a heating chamber, afire-box or combustion chamber communicating therewith, a flue chambersurrounding the heating chamber, openings in the side walls of saidheating chamber near the front end, said openings communicating with thefine-chamber, and achimney leading from the flue chamber at the top ofthe furnace; substantially as described.

2. In a furnace, the combination of a heating chamber,a fire-box orcombustion chamber communicating therewith, a screen or baffle erectedin the heating chamber and adapted to deflect the gases into the upperportion of the same, a flue chamber surrounding said heating chamber,openings in the side walls of the lower part of said heating chambernear the front end, said openings leading into the flue chamber, and achimney leading from the flue chamber at the top of the furnace;substantially as described.

3. In a furnace, the combination of a heating chamber,a fire-boxorcombustion chamber communicating therewith at one end, a fluechambersurrounding the heating chamber, openings in the side walls of saidheating chamber near the front end, said openings communicating with theflue-chamber, an airheating chamber surrounding the flue-chamher, andopenings leading from said air-heating chamber into the combustionchamber below the grate; substantially as described.

0 4. In a furnace, the combination of a heating chamber, a fire-box orcombustion chamber communicating therewith at one end, a flue chambersurrounding the heating chamber, openings in the side walls of saidheating chamber near the front end, said openings communicating with theflue chamber, an air-heating chamber surrounding the hue chamber, andopenings leading from said airheating chamber into the throat-waybetween the said combustion chamber and the heating chamber;substantially as described.

5. In a furnace, the combination of a heatin g chamber, a firebox orcombustion chamber communicating therewith atone end, a screen or baffleerected in the heating chamber in 5 front of the opening leading fromthe combustion chamber and adapted to deflect the gases into the upperportion of the heating chamber, a flue-chamber surrounding said heatingchamber, openings in the side walls of the lower part of theheatingchamber near the end opposite the combustion chamber, said openingsleading into the flue chamber, an airheating chamber surrounding theflue chamber, valved openings leading from said airheating chamber intothe combustion chamber beneath the grate, and into the throat-waybetween the said combustion chamber and the heating chamber, an inlet inthe top of the air-heating chamber for air under pressure, 69 and achimney leadingfrom the flue-chau1ber at the top of the furnace;substantially as described.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

